Control Child Elements

• label is required:

  <input xmlns="http://www.w3.org/2002/xforms"
    model="p1" 
    ref="/doughnuts/quantity">
    
    <!-- Always shown -->
    <label>Quantity</label>
    
    <!-- If the user asks -->
    <help>Tell us how many doughnuts you want; e.g. 3</help>
    
    <!-- tool tip or some such -->
    <hint>They're really yummy!</hint> 
    
    <!-- If the user makes a mistake -->
    <alert>
      <output ref="/doughnuts/quantity"/> is not a valid number of doughnuts.
    </alert>
  </input>

• help, hint, and alert are optional

• Must appear in this order: label, help, hint, and alert